Détails:
The Boeing 747-48EF cargo plane was on approach to runway 25L at Frankfurt International Airport, Germany. In the area of the outer marker to runway 25L at a height of 1400 ft AMSL the landing flaps were moved to the 30° position. The approach speed at this time was 160 kt (IAS). Shortly after actuating the flap lever, the crew heard an impact sound and noticed vibrations. The plane rolled about 1° to the left. The autopilot levelled out the incline and the aircraft continued its approach. The landing was without further problems on runway 25L. The aircraft then rolled to the parking position.
It appeared a part of the left wing flap (Inboard Fore Flap) with dimensions of about 4.5 x 1 m was missing. The fracture was about half a metre to the left of the inner flap attachment. The remaining flap piece was twisted around the inner attachment point and was jammed between the attachment and the fuselage. Two connecting rods between of the front and middle landing flaps were broken or torn out.
The outer fuselage skin of the aircraft was penetrated in the area between the fairing outlet and the rear cargo door over a length of 3.5 m. In this area, the ribs showed heavy damage.
The missing flap part was located in a forest on December 12, 2009.
Conclusions: "The flap fitting was destroyed by a pronounced vibration fracture, which probably originated in a corrosion cavity ."
| Statuts: | Accident investigation report completed and information captured |
| Date: | vendredi 8 mai 2009 |
| Heure: | 21:59 |
| Type/Sous-type: |  Boeing 747-48EF |
| Compagnie: | Asiana Airlines |
| Immatriculation: | HL7419 |
| Numéro de série: | 25781/1044 |
| Année de Fabrication: | 1994-10-13 (14 years 7 months) |
| Heures de vol: | 72700 |
| Cycles: | 12296 |
| Moteurs: | 4 General Electric CF6-80C2B1F |
| Equipage: | victimes: 0 / à bord: 3 |
| Passagers: | victimes: 0 / à bord: 0 |
| Total: | victimes: 0 / à bord: 3 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Repaired |
| Lieu de l'accident: | près de Frankfurt International Airport (FRA) ( Allemagne)
|
| Phase de vol: | En approche (APR) |
| Nature: | Cargo |
| Aéroport de départ: | Wien-Schwechat International Airport (VIE/LOWW), Autriche |
| Frankfurt International Airport (FRA/EDDF), Allemagne |
The Boeing 747-48EF cargo plane was on approach to runway 25L at Frankfurt International Airport, Germany. In the area of the outer marker to runway 25L at a height of 1400 ft AMSL the landing flaps were moved to the 30° position. The approach speed at this time was 160 kt (IAS). Shortly after actuating the flap lever, the crew heard an impact sound and noticed vibrations. The plane rolled about 1° to the left. The autopilot levelled out the incline and the aircraft continued its approach. The landing was without further problems on runway 25L. The aircraft then rolled to the parking position.
It appeared a part of the left wing flap (Inboard Fore Flap) with dimensions of about 4.5 x 1 m was missing. The fracture was about half a metre to the left of the inner flap attachment. The remaining flap piece was twisted around the inner attachment point and was jammed between the attachment and the fuselage. Two connecting rods between of the front and middle landing flaps were broken or torn out.
The outer fuselage skin of the aircraft was penetrated in the area between the fairing outlet and the rear cargo door over a length of 3.5 m. In this area, the ribs showed heavy damage.
The missing flap part was located in a forest on December 12, 2009.
Probable Cause:
Conclusions: "The flap fitting was destroyed by a pronounced vibration fracture, which probably originated in a corrosion cavity ."
Accident investigation:
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Opérations de secours
BFU issued 2 Safety Recommendations
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Photos
Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Wien-Schwechat International Airport et Frankfurt International Airport est de 618 km (386 miles).
La distance entre Wien-Schwechat International Airport et Frankfurt International Airport est de 618 km (386 miles).
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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